What is the impact of humidity on the printing quality of BOPP thermal sensitive synthetic paper?

Humidity has a significant impact on the printing quality of BOPP thermal sensitive synthetic paper, mainly reflected in the following aspects:

1、 Paper deformation

BOPP thermal sensitive synthetic paper is prone to absorbing moisture in high humidity environments, resulting in changes in paper size and the appearance of ruffled or tight edges. This deformation can affect the paper feeding and positioning accuracy of the printing machine, leading to problems such as inaccurate overprinting and offset printing positions. In addition, paper deformation may also affect printing pressure and ink transfer, thereby affecting the clarity and color saturation of printed materials.

2、 Ink drying and adhesion

Excessive humidity can prolong the drying time of ink, as the solvents in the ink need to evaporate faster at lower humidity. If the ink is not dried sufficiently, it may cause problems such as adhesion and smudging of printed materials. At the same time, changes in humidity may also affect the adhesion of ink on the surface of paper, leading to ink detachment or decreased wear resistance of printed materials.

3、 Stability of printing quality

Changes in humidity can affect the moisture content of BOPP thermosensitive synthetic paper, thereby affecting its physical properties and chemical stability. This may lead to issues such as curling and deformation of printed materials during storage and use, affecting the overall quality and stability of the printed materials.

To reduce the impact of humidity on the printing quality of BOPP thermal sensitive synthetic paper, the following measures can be taken:

Control the humidity in the printing workshop: Maintain a relatively stable humidity in the printing workshop to avoid adverse effects on paper and ink caused by high or low humidity. Generally speaking, the relative humidity in the printing workshop should be controlled between 50% and 65%.

Choose suitable paper: Choose BOPP thermal sensitive synthetic paper with moderate water absorption and good dimensional stability to reduce the impact of humidity changes on paper deformation.

Adjusting printing process parameters: Based on changes in the moisture content and humidity of the paper, adjust the pressure, speed, and ink viscosity of the printing machine appropriately to ensure the clarity and color saturation of the printed material.

Strengthen ink management: use fast drying ink or add desiccants to accelerate the drying speed of ink; At the same time, pay attention to the storage and preservation of ink to avoid moisture or deterioration.

In summary, humidity has a significant impact on the printing quality of BOPP thermal sensitive synthetic paper. In order to obtain high-quality printed materials, it is necessary to strictly control the humidity in the printing workshop, select suitable paper, adjust printing process parameters, and strengthen ink management.